JpGraph Error: HTTP headers have already been sent.
Caused by output from file bargradex11w.php at line 9.
Explanation:
HTTP headers have already been sent back to the browser indicating the data as text before the library got a chance to send it's image HTTP header to this browser. This makes it impossible for the library to send back image data to the browser (since that would be interpretated as text by the browser and show up as junk text).
Most likely you have some text in your script before the call to Graph::Stroke(). If this texts gets sent back to the browser the browser will assume that all data is plain text. Look for any text, even spaces and newlines, that might have been sent back to the browser.
For example it is a common mistake to leave a blank line before the opening "<?php".
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
</head>
<body >
<?
include ("C:/AppServ/www/jpgraph/src/jpgraph.php");
include ("../jpgraph/src/jpgraph_bar.php");
// We need some data
$datay=array(10,25,21,35,31,6);
$datax=array("Jan","Feb","Mar","Apr","May","June");
// Setup the graph.
$graph = new Graph(600,200,"auto");
$graph->img->SetMargin(60,20,30,50);
$graph->SetScale("textlin");
$graph->SetMarginColor("lightblue");
$graph->SetShadow();
// Set up the title for the graph
$graph->title->Set("Bar gradient (Left reflection)");
$graph->title->SetFont(FF_VERDANA,FS_NORMAL,12);
$graph->title->SetColor("darkred");
// Setup font for axis
$graph->xaxis->SetFont(FF_VERDANA,FS_NORMAL,10);
$graph->yaxis->SetFont(FF_VERDANA,FS_NORMAL,10);
// Show 0 label on Y-axis (default is not to show)
$graph->yscale->ticks->SupressZeroLabel(false);
// Create the bar pot
$bplot = new BarPlot($datay);
$bplot->SetWidth(0.6);
// Setup color for gradient fill style
$bplot->SetFillGradient("navy","#EEEEEE",GRAD_LEFT_REFLECTION);
// Set color for the frame of each bar
$bplot->SetColor("white");
$graph->Add($bplot);
/* Finally send the graph to the browser */
$graph->Stroke();
?>
</body>
</html>
Load balance : Server 01
